Acetic anhydride is prepared in the laboratory by heating sodium acetate with:A.Ethyl chlorideB.Acetyl chlorideC.Conc.{H_2}S{O_4}D.Zinc dust
Acetic anhydride can be prepared in the laboratory by the reaction of **acetyl chloride (B)** with sodium acetate. This is a common method for preparing acetic anhydride.
### Explanation:
When **acetyl chloride** is heated with **sodium acetate**, the following reaction occurs:
\[
CH_3COONa + CH_3COCl \rightarrow (CH_3CO)_2O + NaCl
\]
Here, **acetyl chloride** reacts with **sodium acetate** to form **acetic anhydride** \((CH_3CO)_2O\) along with the by-product sodium chloride (NaCl).
Thus, the correct answer is **(B) Acetyl chloride**.
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